HPS Performance Air Intake Kit for 2015-21 STI

Product Overview

The HPS Performance 837 Series Cold Air Intake Kit (Part #837-573) for the 2015-2021 Subaru WRX STI 2.5L Turbo is designed to maximize airflow and reduce intake temperatures by relocating the air filter outside of the engine bay. By pulling in cooler, oxygen-rich air compared to traditional intake setups, this system delivers dyno-proven gains of +19.4 WHP and +20.5 ft-lbs of torque, along with sharper throttle response and improved top-end power.

This kit features a 2-3/4” mandrel-bent aluminum intake tube, reinforced high-temp silicone couplers, and heavy-duty stainless steel T-bolt clamps for long-lasting reliability under aggressive driving conditions. Built for true bolt-on installation, this intake requires no tuning, triggers no CEL, and installs with no modifications.

Key Features

• Dyno-proven gains of +19.4 WHP and +20.5 ft-lbs torque

• Improved throttle response and stronger top-end performance

• 2-3/4” mandrel-bent aluminum intake tube replaces restrictive factory airbox

• Cold air design relocates the filter outside the engine compartment for cooler inlet temps

• Includes HPS washable and reusable high-flow air filter

• Reinforced high-temp HPS silicone couplers

• 100% stainless steel T-bolt clamps for a secure, leak-free fit

• Step-by-step installation manual with photos

• No tuning required

• No CEL

• No cutting or modification required

• Made in the USA

What’s Included

• Mandrel-bent aluminum intake tube

• Heavy-duty powder coated steel heat shield

• Washable & reusable HPS performance air filter

• 100% stainless steel T-bolt clamps

• High-temp reinforced silicone coupler

• Mounting hardware

• Installation instructions